GB/T 23937-2020 PDF English
US$145.00 · In stock · Download in 9 secondsGB/T 23937-2020: Sodium hydrosulfide for industrial use Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 23937: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 23937-2020 | English | 145 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Sodium hydrosulfide for industrial use
| Valid |
| GB 23937-2009 | English | 85 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
[GB/T 23937-2009] Sodium hydrosulfide for industrial use
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 23937-2020
GB/T 23937-2020: Sodium hydrosulfide for industrial use---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT23937-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.50
G 12
Replacing GB/T 23937-2009
Sodium hydrosulfide for industrial use
Issued on. NOVEMBER 19, 2020
Implemented on. OCTOBER 01, 2021
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Molecular formula and relative molecular mass... 6
4 Classification... 6
5 Technical requirements... 6
6 Test methods... 7
7 Inspection rules... 15
8 Marking, labeling... 16
9 Packaging, transportation and storage... 16
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 23937-2009, “Sodium hydrosulfide for industrial
use”; compared with GB/T GB/T 23937-2009, the main technical changes,
except editorial changes, are as follows.
-- Adjust the classification to 4 specifications, namely 32% (liquid), 38%
(liquid), 43% (liquid) and 70% (solid) (see Chapter 5; Chapter 5 of version
2009);
-- Add indicators for sodium carbonate, sodium thiosulfate, and sodium sulfite
(see Chapter 5);
-- Modify the detection method for sodium sulfide and sodium hydrosulfide
contents; add the detection method for sodium carbonate content (see 6.3,
6.3 of version 2009);
-- Add the detection method for sodium sulfite and sodium thiosulfate
contents (see 6.4);
-- Modify the detection method for iron content (see 6.5; 6.4 of version 2009);
-- Modify inspection rules (see Chapter 7; Chapter 7 of version 2009);
-- Modify the packaging and storage contents (see Chapter 9; Chapter 9 of
version 2009);
This Standard was proposed by China Petroleum and Chemical Industry
Federation.
This Standard shall be under the jurisdiction of National Standardization
Technical Committee of Chemical (SAC/TC 63).
The drafting organizations of this Standard. Shandong Efirm Biochemistry and
Environmental Protection Co., Ltd., Dongying Sankyo Chemical Co., Ltd.,
Shantou Bozhongcheng Clean Energy Co., Ltd., Tangshan Fengshi Chemical
Co., Ltd., NaFine Chemical Industry Group Co., Ltd., Qiaoxu (Jiujiang)
Enterprise Co., Ltd., Zhejiang Shuizhiyin Environmental Protection Technology
Co., Ltd., CenerTech Tianjin Chemical Research and Design Institute Co., Ltd.,
National inorganic salt product quality supervision and Inspection Center.
The drafters of this Standard. Fan Guoqiang, Ma Yunsheng, Zhang Chao, Wei
Junwen, Xue Long, Liang Wangen, Cheng Yunyun, Chen Songquan, Yang
Hongyuan, Chen Aibing, Yang Zhihua, Zeng Qinghui, Zhu Chunlian, Guo
Yongxin, Rui Xue, Li Zixun.
The previous versions of the standards which are replaced by this Standard are.
-- GB/T 23937-2009.
Sodium hydrosulfide for industrial use
Warning -- According to the provisions of Chapter 6 of GB 12268-2012,
this product belongs to the 8th category of corrosive substances, which
can react with acidic substances to generate hydrogen sulfide, which is
easy to cause suffocation poisoning. Be cautious during the operation.
The personnel who use this Standard shall have hands-on experience in
formal laboratory work. This Standard does not address all possible
security issues. It is the responsibility of the user to take appropriate
safety and health measures and to ensure compliance with the conditions
which are set by the relevant national regulations.
1 Scope
This Standard specifies the classification, technical requirements, test methods,
inspection rules, marking, labeling, packaging, transportation and storage of
sodium hydrosulfide for industrial use.
This Standard applies to sodium hydrosulfide for industrial use, which is mainly
used in industries such as mineral processing, pesticides, leather making, dyes,
organic synthesis and water treatment.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB 190, Packing symbol of dangerous goods
GB/T 191-2008, Packaging - Pictorial marking for handling of goods
GB/T 3049-2006, Chemical products for industrial use - General method for
determination of iron content - 1,10-Phenanthroline spectrophotometric
method
GB/T 6678, General principles for sampling chemical products
GB/T 6679, General rules for sampling solid chemical products
GB/T 6680, General rules for sampling liquid chemical products
GB/T 6682-2008, Water for analytical laboratory use - Specification and test
methods
GB/T 8170, Rules of rounding off for numerical values & expression and
judgment of limiting values
3 Molecular formula and relative molecular mass Molecular formula. NaHS
Relative molecular mass. 56.06 (according to the international relative atomic
mass in 2018)
4 Classification
Sodium hydrosulfide for industrial use is divided into 4 specifications. 32%
(liquid), 38% (liquid), 43% (liquid) and 70% (solid).
5 Technical requirements
The technical requirements of sodium hydrosulfide for industrial use shall meet
the requirements of Table 1.
6 Test methods
6.1 General provisions
The reagents and water that are used in this Standard, when no other
requirements are specified, refer to analytical reagents and grade-III water
which is specified in GB/T 6682-2008.
6.2 Appearance inspection
Under natural light, visually judge the appearance.
6.3 Determination of sodium sulfide, sodium hydrosulfide and sodium
carbonate contents
6.3.1 Principle
Add barium chloride to the sample solution to precipitate sodium carbonate; use
hydrochloric acid standard titration solution to titrate;
6.3.2 Reagents or materials
6.3.2.5 Phenolphthalein indicator solution (10 g/L).
6.3.2.6 Bromocresol green-methyl red indicator solution.
6.3.3 Instruments and apparatuses
Acidimeter or automatic potentiometric titrator. the accuracy is 0.02 pH unit; it
is equipped with calomel electrode and glass electrode or composite electrode.
6.3.4 Test procedure
6.3.4.1 Preparation of test solution
6.3.5 Test data processing
6.3.5.1 Sodium sulfide content
The sodium sulfide content is calculated, as mass fraction w1 of sodium sulfide
(Na2S), according to Formula (1).
6.3.5.2 Sodium hydrosulfide content
The sodium hydrosulfide content is calculated, as mass fraction w2 of sodium
hydrosulfide (NaHS), according to Formula (2).
6.3.5.3 Sodium carbonate content
The sodium carbonate content is calculated, as mass fraction w3 of sodium
carbonate (Na2CO3), according to Formula (3).
6.4 Determination of sodium sulfite and sodium thiosulfate contents
6.4.1 Principle
After adding sodium carbonate solution to the test solution, add zinc sulfate
solution; the formed zinc carbonate suspension precipitates sulfide ions. Take
a portion of filtrate and add the formaldehyde solution to mask the sodium sulfite;
use iodine standard titration solution to titrate the sodium thiosulfate. Take
another portion of filtrate; use the iodometry to determine the combined content
of sodium thiosulfate and sodium sulfite; subtract the equivalent amount of
sodium thiosulfate content, to gain the difference between the two, which is the
sodium sulfite content.
6.4.2 Reagents or materials
6.4.3 Instruments and apparatuses
Micro burette. 10 mL, division value of 0.05 mL.
6.4.4 Test procedure
6.4.4.1 Pipette 200 mL of test solution B; place it in a 500 mL volumetric flask;
successively add 60 mL of sodium carbonate solution, 120 mL of zinc sulfate
solution, 40 mL of 95% ethanol; add water to dilute to the mark; shake well; dry
filter; discard the first 20 mL of filtrate; collect the filtrate in a 500 mL conical
flask.
6.5.2 Reagents or materials
6.5.2.1 Hydrogen peroxide. 30% solution.
6.5.2.2 Other reagents are the same as Chapter 4 of GB/T 3049-2006.
6.5.3 Instruments and apparatuses
6.5.3.1 Porcelain crucible. 50 mL.
6.5.3.2 Cuvette. 5 cm.
6.5.3.3 High temperature furnace. The temperature can be controlled at 600 °C
± 20 °C.
6.5.3.4 Other equipment is the same as Chapter 5 of GB/T 3049-2006.
6.5.4 Test procedure
6.5 mL of hydrogen peroxide solution while stirring in a fume hood; continue to
stir for 1 min.
6.5.5 Test data processing
The iron content is calculated, as mass fraction w6 of iron (Fe), according to
Formula (6).
7 Inspection rules
7.1 This Standard adopts type inspection and delivery inspection. Type
inspection and delivery inspection shall meet the following requirements.
7.2 Products which are produced with the same materials and basically the
same production conditions continuously or in the same group, by the
production enterprise, are the same batch. Each batch of solid products does
not exceed 60 t; liquid products are determined according to the size of the
storage container.
7.3 Determine the number of sampling units and sampling method in
accordance with the provisions of GB/T 6678, GB/T 6679, and GB/T 6680.Mix
at least 200 g of liquid or 100 g of solid samples evenly; then, put them in two
clean and dry sample bottles or sample bags respectively; label them, marking.
7.4 When any indicator of the inspection result does not meet the requirements
of this Standard, it shall sample from double the packages for re-inspection; If
any indicator the re-inspection result does not meet the requirements of this
Standard, the whole batch of products shall be judged as unqualified.
8 Marking, labeling
8.1 The packaging container of sodium hydrosulfide for industrial use shall have
clear, obvious, and firm marking, including. manufacturer name, site, product
name, specification, net content, batch number or production date, and the
number of this Standard, as well as the label of "corrosive material” that is
specified in GB 190, and the labels of “afraid of sun” and “afraid of rain” that are
specified in GB/T 191-2008.
8.2 Each batch of delivered sodium hydrosulfide for industrial use shall be
accompanied by a safety technical specification and a quality certificate. The
content of the quality certificate includes.
9 Packaging, transportation and storage
9.1 Packaging
Solid flake sodium hydrosulfide is packaged in bags; the net contents of each
packaging unit are respectively 25 kg and 900 kg. Solidified sodium
hydrosulfide is packaged in iron drums;
9.2 Transportation
When transporting sodium hydrosulfide products for industrial use, pay
attention to prevent sunlight, rain, and heat, and keep the packaging intact.
9.3 Storage
Sodium hydrosulfide products for industrial use shall be stored in a cool, dry
and ventilated warehouse, protected from rain, moisture, and heat, and cannot
be in contact with acid, alkali and corrosive materials.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 23937-2020 be delivered?Answer: The full copy PDF of English version of GB/T 23937-2020 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 23937-2020_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 23937-2020_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 23937-2020 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. Question 5: Should I purchase the latest version GB/T 23937-2020?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 23937-2020 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. How to buy and download a true PDF of English version of GB/T 23937-2020?A step-by-step guide to download PDF of GB/T 23937-2020_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 23937-2020".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|